Are you able to create a custom map to use as the basemap in your Survery123? If so, how is this done.
I've not tried this, but here is some documentation that may help
Include a map in your survey—Survey123 for ArcGIS | ArcGIS
I have used ESRI Labs Tile Package Kreator. Taking your maps offline with Tile Package Creator
Thanks! Success! Also see related question which I didn't find until after I posed: Is there any way to use my own basemaps in the Survey123-Report?
Retrieving data ...